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Programming the Status System 7Chapter 2
Chapter 2
Programming the Status System
About this Chapter
This chapter discusses the structure of the status system used in SCPI
instruments and explains how to program status registers. An important
feature of SCPI instruments is that they all implement status registers in the
same way. The status system is explained in the following sections:
• General Status Register Model
This section explains the way that status registers are structured in
SCPI instruments. It also contains an example of how bits in the
various registers change with different input conditions.
• Required Status Groups
This section describes the minimum required status registers present in
SCPI instruments. These status registers cover the most frequently
used functions.
General Status Register Model
The generalized status register model shown in Figure 2-1 is the building
block of the SCPI status system. This model consists of a condition register,
transition filter, an event register, and an enable register. A set of these
registers is called a status group.
When a status group is implemented in an instrument, it always contains all
of the component registers. However, there is not always a corresponding
command to read or write to every register.
Figure 2-1. Generalized Status Register Model